The seal and bearing are in the tranny in such a way that they must be taken out from the inside, im sure you could do it in your garge, but you will need to tlak to somone who has done it so see how far you have to go and what all you have to pull apart to get to them, call around and get a quote and see if its worth it to you...If you do end up trying it yourself, best of luck, and enjoy the awesome learning experience, i so wish i had a second tranny lyin to rebuild and learn from, would save me a lot of money lol.